| 摘要 |
PURPOSE:To extremely reduce the noise generated at controlling or the shock of a mobile part, by providing a means to simultaneously applying both the drive force and the reverse drive force in a prescribed direction each at the early time of a reciprocal motion member. CONSTITUTION:A disk board moves backward continuously to reach a lead switch 35 provided at the stop position of the original board. Thus the output of the original board move-backward signal DBRV is turned off to stop the movement of the original board. Then a transistor TR302 is turned off to cut the electric conduction to a move- backward clutch 320, and 0 is supplied to a terminal of a NOR gate 306. In this case, the terminal voltage of a capacitor 316 produces a move-backward signal which is delayed by a prescribed time T as shown in a chart B. This move-backward signal is supplied to an inverter 305 and then transmitted to the other input terminal of the gate 306. The output of the gate 306 delivers a pulse of time T as shown by C in the diagram. The a move-forward clutch 321 is driven for the time T during which the signal is transmitted to a TR303 via a resistance 314. Thus the original board receives the sudden drive in the opposite direction from the clutch 321 to eliminate the inertia of the backward movement. Thus the original board stops smoothly at a prescribed position. |
